<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图 -->
    <el-card>
      <!-- 提示区域 -->
      <el-alert
        title="添加商品信息"
        type="info"
        center
        show-icon
        :closable="false"
      >
      </el-alert>

      <!-- 步骤条区域 -->
      <el-steps
        :space="200"
        :active="activeIndex - 0"
        finish-status="success"
        align-center
      >
        <el-step title="基本信息"></el-step>
        <el-step title="商品参数"></el-step>
        <el-step title="商品属性"></el-step>
        <el-step title="商品图片"></el-step>
        <el-step title="商品内容"></el-step>
        <el-step title="完成"></el-step>
      </el-steps>

      <!-- tab栏区域 -->
      <el-form
        :model="addForm"
        :rules="addFormRules"
        ref="addFormRef"
        label-width="100px"
        label-position="top"
      >
        <el-tabs
          v-model="activeIndex"
          :tab-position="'left'"
          :before-leave="beforeTabLeave"
          @tab-click="tabClicked()"
        >
          <el-tab-pane label="基本信息" name="0">
            <el-form-item label="商品名称" prop="goods_name">
              <el-input v-model="addForm.goods_name"></el-input>
            </el-form-item>
            <el-form-item label="商品价格" prop="goods_price">
              <el-input v-model="addForm.goods_price" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品重量" prop="goods_weight">
              <el-input v-model="addForm.goods_weight" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品数量" prop="goods_number">
              <el-input v-model="addForm.goods_number" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品分类" prop="goods_cat">
              <el-cascader
                v-model="addForm.goods_cat"
                :options="cateList"
                props.expandTrigger="hover"
                :props="catProps"
                @change="handleChange"
              ></el-cascader>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品参数" name="1">
            <!-- 渲染表单的item项 -->
            <el-form-item
              :label="item.attr_name"
              v-for="item in manyTableData"
              :key="item.attr_id"
            >
              <!-- 复选框组 -->
              <el-checkbox-group v-model="item.attr_vals">
                <el-checkbox
                  border
                  :label="cb"
                  v-for="(cb, i) in item.attr_vals"
                  :key="i"
                ></el-checkbox>
              </el-checkbox-group>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品属性" name="2">
            <el-form-item
              :label="item.attr_name"
              v-for="item in onlyTableData"
              :key="item.attr_id"
            >
              <el-input v-model="item.attr_vals"></el-input>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品图片" name="3">
            <!-- action 表示图片要上传到的api地址 -->
            <el-upload
              :action="uploaUrl"
              :on-preview="handlePreview"
              :on-remove="handleRemove"
              list-type="picture"
              :headers="headerObj"
              :on-success="handleSuccess"
            >
              <el-button size="small" type="primary">点击上传</el-button>
              <div slot="tip" class="el-upload__tip">
                只能上传jpg/png文件，且不超过500kb
              </div>
            </el-upload>
          </el-tab-pane>
          <el-tab-pane label="商品内容" name="4">
            <!-- 富文本编辑器组件 -->
            <quill-editor v-model="addForm.goods_introduce"></quill-editor>
          <!-- 添加商品的按钮 -->
          <el-button type="primary" class="btnAdd" @click="add()">添加商品 </el-button>
          </el-tab-pane>
        </el-tabs>
      </el-form>
    </el-card>

    <!-- 图片预览 -->
    <el-dialog title="图片预览" :visible.sync="previewVisible" width="50%">
      <img :src="previewPath" alt="" class="previewImg" />
    
    </el-dialog>
  </div>
</template>

<script>
import _ from 'lodash'

export default {
  data() {
    return {
      activeIndex: '0',
      // 添加商品的表单数据对象
      addForm: {
        goods_name: '',
        goods_price: '',
        goods_weight: '',
        goods_number: '',
        // 商品所属的分类数组
        goods_cat: [],
        // 图片数组
        pics: [],
        // 商品的详情描述
        goods_introduce:'',
        attrs:[]
      },
      addFormRules: {
        goods_name: [
          { required: true, message: '请输入商品名称', trigger: 'blur' },
        ],
        goods_price: [
          { required: true, message: '请输入商品价格', trigger: 'blur' },
        ],
        goods_weight: [
          { required: true, message: '请输入商品重量', trigger: 'blur' },
        ],
        goods_number: [
          { required: true, message: '请输入商品数量', trigger: 'blur' },
        ],
        goods_cat: [
          { required: true, message: '请选择商品分类', trigger: 'blur' },
        ],
      },
      // 商品分类列表
      cateList: [],
      // 这里value是String的吗？
      catProps: {
        label: 'cat_name',
        value: 'cat_pid',
        children: 'children',
      },
      // 动态参数列表数据
      manyTableData: [],
      // 静态属性列表数据
      onlyTableData: [],
      // 上传图片的url地址
      uploaUrl: 'http://localhost:8888/api/private/v1/upload',
      // 图片上传组件的header请求头对象
      headerObj: {
        Authorization: window.sessionStorage.getItem('token'),
      },
      //保存预览图片的url地址
      previewPath: '',
      previewVisible: false,
    }
  },
  created() {
    this.getCateList()
  },
  methods: {
    // 获取所有商品分类数据
    async getCateList() {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200)
        return this.$message.error('获取商品分类数据失败！')
      this.cateList = res.data
    },
    // 级联选择器选中项变化会触发这个函数
    handleChange() {
      // console.log(this.addForm.goods_cat);
      if (this.addForm.goods_cat.length !== 3) this.addForm.goods_cat = []
    },
    beforeTabLeave(activeName, oldActiveName) {
      // console.log('即将离开的标签页'+oldActiveName);
      // console.log('即将进入的标签页'+activeName);
      // return false

      if (oldActiveName === '0' && this.addForm.goods_cat.length !== 3) {
        this.$message.error('请先选择商品分类!')
        return false
      }
    },
    async tabClicked() {
      //当用户点击切换tab栏时触发
      if (this.activeIndex === '1') {
        //发送请求获取动态参数
       
        // console.log('查询的this.cateId', this.cateId)
        const { data: res } = await this.$http.get(
          `categories/${this.cateId}/attributes`,
          {
            params: { sel: 'many' },
          }
        )

        if (res.meta.status !== 200) {
          return this.$message.error('获取动态参数列表失败')
        }
        console.log(res.data)
        //将attr_vals字符串转换为数组
        res.data.forEach((item) => {
          item.attr_vals =
            item.attr_vals.length === 0 ? [] : item.attr_vals.split(',')
        })
        this.manyTableData = res.data
      } else if (this.activeIndex === '2') {
        const { data: res } = await this.$http.get(
          `categories/${this.cateId}/attributes`,
          {
            params: { sel: 'only' },
          }
        )

        if (res.meta.status !== 200) {
          return this.$message.error('获取静态属性列表失败')
        }
        console.log(res.data)
        this.monlyTableData = res.data
      }
    },
    // 处理图片预览效果
    handlePreview(file) {
      console.log(file)
      //当用户点击图片进行预览时执行，处理图片预览
      //形参file就是用户预览的那个文件
      this.previewPath = file.response.data.url
      //显示预览图片对话框
      this.previewVisible = true
    },
    // 处理移除图片的操作
    handleRemove(file) {
      // console.log(file);
      //当用户点击X号删除时执行
      //形参file就是用户点击删除的文件
      //获取用户点击删除的那个图片的临时路径
      const filePath = file.response.data.tmp_path
      //使用findIndex来查找符合条件的索引
      const index = this.addForm.pics.findIndex((item) => item.pic === filePath)
      //移除索引对应的图片
      this.addForm.pics.splice(index, 1)
    },
    // 监听图片上传成功的事件
    handleSuccess(response) {
      console.log(response)
      // 1、拼接得到一个图片信息对象
      const picInfo = {
        pic: response.data.tmp_path,
      }
      // 2、将图片信息对象,push到pics数组中
      this.addForm.pics.push(picInfo)
      console.log(this.addForm)
    },
    // 添加商品
    add(){
      // console.log(this.addForm);
      this.$refs.addFormRef.validate(
       async valid=>{
          if(!valid){
            return this.$message.error('请填写必要的表单项！')
          }
          
          // 执行添加的业务逻辑
          // lodash  cloneDeep(obj)
          const form=_.cloneDeep(this.addForm)
          form.goods_cat=form.goods_cat.join(',')
          // 处理动态参数
          this.manyTableData.forEach(item=>{
            const newInfo={attr_id:item.attr_id,
            attr_value:attr_vals.join(' ')}
            this.addForm.attrs.push(newInfo)
          })
          // 处理静态属性
          this.onlyTableData.forEach(item=>{
            const newInfo={attr_id:item.attr_id,
            attr_value:attr_vals}
            this.addForm.attrs.push(newInfo)
          })
          form.attrs=this.addForm.attrs
          console.log(form);
          // 发起请求，添加商品
          // 商品的名称必须是唯一的
         const {data:res}=await this.$http.post('goods',form)
         if(res.meta.status!==201) {
           return this.$message.error('添加商品失败！')
         }
         this.$message.success('添加商品成功!')
         this.$router.push('/goods')
        }

      )
    }
  },
  computed: {
    cateId() {
      if (this.addForm.goods_cat.length === 3) {
        return this.addForm.goods_cat[2]
      }
      return null
    },
  },
}
</script>

<style lang="less" scoped>
.el-checkbox {
  margin: 0 !important;
}
.btnAdd {
  margin-top: 15px;
}

.previewImg {
  width:100%
}
</style>